Switch pull before water?

[janis]

Look here:

http://www.volvospeed.com/volvo_performance.php

Check "modifications"

look for aquamist. There's a detailed (with pictures) description on how to install an aquamist in a volvo 850!.
Should be helpfull info for other kits as well.

They use the open port of the vacuum tree.

I don't really understand what water comes near the switch?

Janis